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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 28 — Oct. 1, 2011
  • pp: 5592–5599

Stand-off detection of explosives particles by multispectral imaging Raman spectroscopy

Henric Östmark, Markus Nordberg, and Torgny E. Carlsson  »View Author Affiliations


Applied Optics, Vol. 50, Issue 28, pp. 5592-5599 (2011)
http://dx.doi.org/10.1364/AO.50.005592


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Abstract

A Raman multispectral imaging technique is presented, which can be used for stand-off detection of single explosives particles. A frequency-doubled Nd:YAG laser operating at 10 Hz illuminates the surface under investigation. The backscattered Raman signal is collected by a receiver subsystem consisting of a 150 mm Schmidt–Cassegrain telescope, a laser line edge filter, a liquid-crystal tunable filter, and a gated intensified charge-coupled device (ICCD) detector. A sequence of images is recorded by the ICCD, where, for each recording, a different wavelength is selected by the tunable filter. By this, a Raman spectrum is recorded for each pixel, which makes it possible to detect even single particles when compared to known spectra for possible explosives. The comparison is made using correlation and least-square fitting. The system is relatively insensitive to environment and light variations. Multispectral Raman images of sulfur, ammonium nitrate, 2,4-dinitrotoluene, and 2,4,6-trinitrotoluene were acquired at a stand-off distance of 10 m . Detection of sulfur particles was done at a distance of 10 m .

© 2011 Optical Society of America

OCIS Codes
(280.0280) Remote sensing and sensors : Remote sensing and sensors
(280.3420) Remote sensing and sensors : Laser sensors
(300.6450) Spectroscopy : Spectroscopy, Raman
(110.4234) Imaging systems : Multispectral and hyperspectral imaging

ToC Category:
Remote Sensing and Sensors

History
Original Manuscript: April 25, 2011
Manuscript Accepted: May 17, 2011
Published: September 30, 2011

Citation
Henric Östmark, Markus Nordberg, and Torgny E. Carlsson, "Stand-off detection of explosives particles by multispectral imaging Raman spectroscopy," Appl. Opt. 50, 5592-5599 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-28-5592

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